Governor Davis didn't change the law - he doesn't have the authority. Thats the job of the legislature.
Look under history. Can you believe it? Oh, the horrors < /sarcasm>
Existing law requires the Commissioner of the California Highway Patrol to adopt regulations providing that exhaust systems comply with statutory noise restrictions if they are installed on motor vehicles, other than motorcycles and new motor vehicles, with a gross vehicular weight of less than 6,000 pounds and emit no more than 95 dbA.
Hmmmm, I don't see 86 dbA anywhere on that bill. Maybe you have a special version the rest of us don't?